Here is the full list of all 23 Loddlenaut achievements.
Pet a loddle.
Release a loddle into the open ocean.
Leave GUP-14.
Reach the maximum loddle capacity in a biome.
Have the maximum number of loddles following you.
Run out of oxygen for the first time.
Find all Holo-Badges.
Destroy 80 crates.
Clean all biomes on GUP-14.
Find the abandoned CEO office.
Enter Metzi Trench.
Cook a loddle snack.
Collect 500 pieces of litter.
Unlock the Puddle Scrubber.
Evolve a baby loddle into an adult.
Discover a loddle’s favorite food.
Find a Holo-Badge.
Clean a biome to 100%.
Clean up a goopy loddle.
Meet a loddle for the first time.
Complete the Home Cove tutorial.
Reach the maximum loddle capacity in all biomes.
Encounter all loddle evolutions.